the last one in book raton -- boca raton focusing on a foreign policy. all that live on c-span, c-span radio, and c-span.org. >> we need to tackle our nation's challenges before they tackle us. we need to strengthen medicare and social security. we're putting ideas on the table to do that. we will save these benefits for seniors and my generation so that these promises are kept. >> they have laid out clearly, they say, what barack obama and joe biden did is they endangered medicare. they stole money from medicare for amacare, and you see the ads in here and everything they say. nothing could be further from the truth. >> october 11, congressman paul ryan and vice president joe biden will face off in their only debate. abc news' martha raddatz moderates, and you can watch our live debate preview starting at 7:00 p.m. eastern, followed by the debate at 9:00. follow our live coverage on c- span, c-span radio, an online at c-span.org. >> up next, a look at the immediate impact last night's debate had on of voters. charlie cook talked this morning with a repu